You have two FIFO queues with the same MessageGroupId 'group1'. If messages M1 and M2 are sent to queue A, and M3 and M4 to queue B, what can you say about the order of message processing?

hard📝 Application Q8 of 15

AWS - SNS and SQS

AMessages in each queue are ordered, but no order across queues

BAll messages across both queues are processed in order M1, M2, M3, M4

CMessages are processed randomly across both queues

DMessages in queue B are processed before queue A

Step-by-Step Solution

Solution:

Step 1: Understand FIFO ordering scope
Ordering is guaranteed only within a single FIFO queue per MessageGroupId.
Step 2: Analyze multiple queues with same group ID
Messages in each queue maintain order, but no ordering is guaranteed across different queues.
Final Answer:
Messages ordered per queue, no order across queues -> Option A
Quick Check:
FIFO ordering is queue-scoped, not global [OK]

Quick Trick: FIFO order applies only within one queue, not across queues [OK]

Common Mistakes:

Assuming global ordering across queues
Thinking messages from queue B come before A
Believing messages are randomly ordered within queues

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More AWS Quizzes

You have two FIFO queues with the same MessageGroupId 'group1'. If messages M1 and M2 are sent to queue A, and M3 and M4 to queue B, what can you say about the order of message processing?

Step 1: Understand FIFO ordering scope

Step 2: Analyze multiple queues with same group ID

Final Answer:

Quick Check:

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